{
  "bibcode": "2013GCN.14212....1B",
  "body": "Nat Butler (ASU), Antonino Cucchiara (UCSC), William H. Lee (UNAM),\nAlexander Kutyrev (GSFC), Alan M. Watson (UNAM), Michael G. Richer (UNAM),\nChris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom\n(UCB), Eleonora Troja (GSFC), Enrico Ramirez���Ruiz (UCSC), Jos�� A. de Diego\n(UNAM), Leonid Georgiev (UNAM), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga\n(UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:\n\nWe observed the field of GRB 130215A (D'Elia et al.; GCN 14204) with the\nReionization and Transients Infrared Camera (RATIR; www.ratir.org) on the\n1.5m Harold Johnson Telescope at the Observatorio Astron��mico Nacional on\nSierra San Pedro M��rtir from 2013/02 15.13 to 2013/02 15.18 UTC (1.58 to\n2.88 hours after the BAT trigger) through intermittent clouds, obtaining a\ntotal of 25 minutes of useful exposure in the r' and i' bands and 19\nminutes of useful exposure in the Z and J bands.\n\nWe detect the optical counterpart discovered by ROTSE (Zheng et al.; GCN\n14205).   In comparison with USNO-B1 and 2MASS, we derive the following\nmagnitudes in the AB system:\n\n  r' = 17.86 +/- 0.05\n  i' = 17.10 +/- 0.04\n  Z = 16.86 +/-0.04\n  J = 16.67 +/- 0.04\n\nThese magnitudes are not corrected for Galactic extinction in the direction\nof the GRB.  Compared to the earlier observation at Palomar (Cenko et al;\nGCN 14209), our r band magnitude implies a temporal fade by >1 mag on a\ntimescale of 2 hours, with a corresponding power law fade f ~ t^(-1.5)\nbetween 1 and 3 hours after the GRB.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 14212,
  "createdOn": 1360925289000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 130215A: RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 130215A"
}